random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
==================================================================
BUG: KASAN: use-after-free in __list_del_entry_valid+0xe7/0xf3 lib/list_debug.c:54
Read of size 8 at addr ffff8801aca794e0 by task syz-executor589/4566

CPU: 0 PID: 4566 Comm: syz-executor589 Not tainted 4.17.0-rc6+ #61
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 __list_del_entry_valid+0xe7/0xf3 lib/list_debug.c:54
 __list_del_entry include/linux/list.h:117 [inline]
 list_del include/linux/list.h:125 [inline]
 cma_cancel_listens drivers/infiniband/core/cma.c:1553 [inline]
 cma_cancel_operation+0x457/0xe90 drivers/infiniband/core/cma.c:1581
 rdma_destroy_id+0xff/0xe50 drivers/infiniband/core/cma.c:1645
 ucma_close+0x100/0x300 drivers/infiniband/core/ucma.c:1755
 __fput+0x34d/0x890 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1e4/0x290 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1aee/0x2730 kernel/exit.c:865
 do_group_exit+0x16f/0x430 kernel/exit.c:968
 get_signal+0x886/0x1960 kernel/signal.c:2482
 do_signal+0x98/0x2040 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_64+0x6ac/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445dc9
RSP: 002b:00007fc7a40a9da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006dbc3c RCX: 0000000000445dc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000006dbc3c
RBP: 00000000006dbc38 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 006d635f616d6472
R13: 2f646e6162696e69 R14: 666e692f7665642f R15: 0000000000000005

Allocated by task 4563:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 kmem_cache_alloc_trace+0x152/0x780 mm/slab.c:3620
 kmalloc include/linux/slab.h:512 [inline]
 kzalloc include/linux/slab.h:701 [inline]
 __rdma_create_id+0xd7/0x710 drivers/infiniband/core/cma.c:753
 ucma_create_id+0x385/0x9b0 drivers/infiniband/core/ucma.c:502
 ucma_write+0x328/0x410 drivers/infiniband/core/ucma.c:1676
 __vfs_write+0x10b/0x960 fs/read_write.c:485
 vfs_write+0x1f8/0x560 fs/read_write.c:549
 ksys_write+0xf9/0x250 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 4566:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xd9/0x260 mm/slab.c:3813
 rdma_destroy_id+0x8c5/0xe50 drivers/infiniband/core/cma.c:1676
 ucma_close+0x100/0x300 drivers/infiniband/core/ucma.c:1755
 __fput+0x34d/0x890 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0x1e4/0x290 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1aee/0x2730 kernel/exit.c:865
 do_group_exit+0x16f/0x430 kernel/exit.c:968
 get_signal+0x886/0x1960 kernel/signal.c:2482
 do_signal+0x98/0x2040 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop+0x28a/0x310 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
 do_syscall_64+0x6ac/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8801aca79300
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 480 bytes inside of
 2048-byte region [ffff8801aca79300, ffff8801aca79b00)
The buggy address belongs to the page:
page:ffffea0006b29e00 count:1 mapcount:0 mapping:ffff8801aca78200 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffff8801aca78200 0000000000000000 0000000100000003
raw: ffffea0006b29220 ffff8801da801948 ffff8801da800c40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801aca79380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801aca79400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801aca79480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff8801aca79500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801aca79580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================